Single sticks, not matched kits — that's how Kingston sells ValueRAM for desktop upgrades. The two listings here are a lone module in two different capacities, rather than a pair meant to run across channels, aimed at simple capacity top-ups more than a dual-channel build from scratch.
This one is 1×16GB, 16GB, rated 3200 MT/s CL22. Buying one module means running single-channel unless it's paired with a second, ideally identical, stick — check whether the board and use case actually call for dual-channel before deciding a single 16GB module is enough.
This is UDIMM DDR4 for standard desktop boards, and like any DDR4 memory it needs the XMP profile selected in BIOS to run at its full 3200 MT/s rating rather than a slower default.